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From the classic three-part formula
Nothing works better
a jar test is highly recommended before applying this product
Works great for both soil and hydroponic situations
21x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack pots From the classic three-part formulaNordic Pure Custom MERV 8 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition
